Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
  • B01D69/12—Composite membranes; Ultra-thin membranes
  • B01D69/1213—Laminated layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
  • B01D67/0002—Organic membrane manufacture
  • B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
  • B01D67/0013—Casting processes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
  • B01D67/0002—Organic membrane manufacture
  • B01D67/0023—Organic membrane manufacture by inducing porosity into non porous precursor membranes
  • B01D67/0025—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching
  • B01D67/0027—Organic membrane manufacture by inducing porosity into non porous precursor membranes by mechanical treatment, e.g. pore-stretching by stretching
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
  • B01D67/0081—After-treatment of organic or inorganic membranes
  • B01D67/0083—Thermal after-treatment
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
  • B01D67/0081—After-treatment of organic or inorganic membranes
  • B01D67/009—After-treatment of organic or inorganic membranes with wave-energy, particle-radiation or plasma
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
  • B01D69/12—Composite membranes; Ultra-thin membranes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
  • B01D69/12—Composite membranes; Ultra-thin membranes
  • B01D69/1216—Three or more layers
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
  • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
  • H01M10/0565—Polymeric materials, e.g. gel-type or solid-type
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/058—Construction or manufacture
  • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
  • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M4/00—Electrodes
  • H01M4/02—Electrodes composed of, or comprising, active material
  • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
  • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
  • H01M50/409—Separators, membranes or diaphragms characterised by the material
  • H01M50/411—Organic material
  • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
  • H01M50/417—Polyolefins
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
  • H01M50/409—Separators, membranes or diaphragms characterised by the material
  • H01M50/411—Organic material
  • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
  • H01M50/42—Acrylic resins
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
  • H01M50/409—Separators, membranes or diaphragms characterised by the material
  • H01M50/411—Organic material
  • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
  • H01M50/423—Polyamide resins
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
  • H01M50/409—Separators, membranes or diaphragms characterised by the material
  • H01M50/411—Organic material
  • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
  • H01M50/426—Fluorocarbon polymers
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
  • H01M50/409—Separators, membranes or diaphragms characterised by the material
  • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
  • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
  • H01M50/491—Porosity
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2325/00—Details relating to properties of membranes
  • B01D2325/04—Characteristic thickness
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D2325/00—Details relating to properties of membranes
  • B01D2325/26—Electrical properties
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M10/00—Secondary cells; Manufacture thereof
  • H01M10/05—Accumulators with non-aqueous electrolyte
  • H01M10/052—Li-accumulators
  • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

• the present invention relates to an electrochemical element
• lithium ion batteries are used.
• the capacity of a battery is proportional to the amount of electrode
• a jellyroll-shaped structure used in a cylindrical or a prismatic
• Such a structure is prepared by a process of coating and pressing
• prismatic-shaped battery comprises the aforesaid process of rolling the spiral
• Patent No. 5,552,239 describes a process of first placing and laminating a
• the laminated cells were so stiff that they were difficult to fold, and when
• Electrolytes are classified as liquid electrolyte and solid electrolyte.
• Liquid electrolyte comprises a salt dissolved and dissociated in an organic
• Liquid electrolyte is generally used
• a polymer separator e.g. a polymer film such as a polyolefin with
• the ionic conductivity varies depending on the porosity of the polymer
• the polyolefin separator generally has an ionic conductivity of
• liquid electrolyte may- leak out of the polymer separator due to
• liquid electrolyte cannot provide adhesion
• the solid electrolyte has an ionic conductivity that is
• liquid electrolyte comprising a salt dissolved in an organic solvent
• a solid polymer electrolyte e.g. a hybrid-type
• the polymer electrolyte requires electrochemical stability in working
• it has an ionic
• the polymer electrolyte adhesion is sufficient to decrease the interfacial resistance between the electrolyte and electrodes
• polymer layer comprises a material that is resistant to swelling due to restrictive
• polyethylene polypropylene, polytetrafluoroethylene, polyethylene
• the gellable polymer comprises a self-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrenethacrylate, polystyrenethacrylate, polystyrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-styrene-s
• the exemplary materials includes polyvinylidenefluoride, polyurethane,
• polyethyleneoxide polyacrylonitrile, polymethylmethacrylate, polyacrylamide,
• the polymer electrolyte has ionic conductivity that is lower
• the plasticizer is harmful to the
• porous polymer layer and the gellable polymer layer weakens.
• separator film or a separator layer is made from a novel multi-component
• composite film consisting of a porous gellable polymer layer and a support layer
• the film has good adhesion between an electrode and a polymer electrolyte
• invention provides an electrochemical element comprising electrochemical cells
• separator film comprises:
• electrochemical element comprising electrochemical
• said electrochemical cells are formed by stacking:
• bicells having a positive electrode, a separator layer, an
• each of said separator film, said separator layer or both comprises:
• Fig. 1 a shows a layered structure of a full cell comprising a single-side
• Fig. 1 b shows a layered structure of a cell where two full cells of Fig. 1 a
• Fig. 2a shows a layered structure of a full cell comprising a both-side
• Fig. 2b shows a layered structure of a cell where two full cells of Fig. 2a
• Fig. 3 shows a layered structure of a stacked cell where a full cell is a
• Fig. 4a shows a layered structure of a bicell comprising two single-side coated positive electrodes, a both-side coated negative electrode, and a
• Fig. 4b shows a layered structure of a cell where two bicells of Fig. 4a
• Fig. 5a shows a layered structure of a bicell where an negative
• electrode is a middle layer and both outer portions are positive electrodes
• Fig. 5b shows a layered structure of a bicell where a positive electrode
• Fig. 6 shows a layered structure of a stacked cell where two types of
• bicells are unit cells of Figs. 5a and 5b;
• Fig. 7 shows a layered structure of a cell composed of two types of
• bicells comprising single-side coated electrodes, both-side
• Fig. 8 shows a multi-component composite film structure, wherein
• gellable polymer layers (42) are located on both sides of a support layer film
• Fig. 9 shows charge and discharge characteristics of the
• Fig. 10 shows charge and discharge cycle characteristics of the
• the subject of the present invention is an electrochemical element comprising electrochemical cells that are multiply-stacked with a separator film interposed between each stacked cell.
• the stacked electrochemical element comprising electrochemical cells that are multiply-stacked with a separator film interposed between each stacked cell.
• electrochemical cells that are multiply-stacked with a bicell or a full cell as a basic unit, with a separator film interposed between each stacked cell.
• the separator film is a film to separate each full cell or each bicell a
• the electrochemical element of stacked cells is more convenient to manufacture and uses space more efficiently. Particularly, it solves the problems relating to
• present invention does not make avail of longitudinally cut electrodes used for
• the electrochemical element of the present invention comprises
• separator layer which is included in the full cell or the bicell, and a separator
• separator film are in the form of a multi-component film comprising a polymer
• Fig. 1 a The most typical cell structure is illustrated in Fig. 1 a, wherein a layered
• the full cell 10 of such a structure is treated as a unit cell
• positive active material 14 mainly comprises lithium intercalation materials such as
• lithium manganese oxide lithium cobalt oxide
• lithium nickel oxide lithium manganese oxide
• lithium cobalt oxide lithium nickel oxide
• lithium nickel oxide lithium nickel oxide
• the negative active material 13 mainly comprises lithium
• lithium metal or lithium alloy and lithium intercalation materials such as carbon,
• a foil prepared from copper, gold, nickel, copper alloy, or a combination thereof,
• the separator layer 15 is a multi-component film comprising a polymer
• the unit structure of the full cell 10 shown in Fig. 1 a is composed of a
• the separator layer 15 is located at the center of the cell.
• the stacked cell 16 shown in Fig. 1 b has only two unit cells stacked as
• the present invention provides a way to make more efficient use of the
• a stacked cell 18 as in Fig. 2b is prepared by stacking two full cells 17
• a plurality of layers is stacked such as
• stacked cell 18 which has a structure of (17)/(17)1 7) ... (17)/(17).
• the stacked cell 20 structure may be very effective for a thin layer card-type battery.
• the overlapping middle electrode plate of the stacked cell 16 structure as shown in Fig. 1 b degrades the efficiency of the cell as discussed above. Therefore, an efficient structure unifying the overlapping electrodes between the cells themselves can be treated as a new unit cell.
• the cell 21 shown in Fig. 4a is such a new unit cell, being a bicell structure having a polarity at the middle and an opposite polarity at both sides.
• a cell having high space utilization can be made by stacking such bicell units as the (21)/(21) structure shown in the stacked bicell 22 of Fig. 4b.
• the present invention provides a way to use the cell structure in a more
• the present invention provides a method of
• bicells 23 and 24 are defined, which use electrodes with both sides coated as
• separator layer 15 or separator film 19 are inserted between the bicells, the
• outer active coating material not used within a bicell is shared with an opposite
• Such a cell can also be stacked into
• the cells, and the bicells are alternately stacked as in
• the outermost-stacked bicell of the battery can be either
• bicell 23 or bicell 24 the only difference being whether the unused electrode
• Fig. 7 shows a stacked cell 26 where the bicell is a basic unit and all
• the electrochemical element According to the present invention, the electrochemical element
• the separator is a multi-component composite film comprising a polymer support layer film and a gellable polymer that are united
• component composite film which is used as a polymer electrolyte, is prepared
• a multi-component composite film of the present invention is
• gellable polymer layers on a common polymer film having no pores
• using the multi-component is prepared by impregnating the composite film with
• polymer electrolyte system may use a simple polymer or a polymer-salt
• the support layer film is preferably prepared by blending or laminating
• polyethylene low-density polyethylene, linear low-density polyethylene, and
• polypropylene high crystalline polypropylene, polyethylene-propylene
• copolymer polyethylene-butylene copolymer, polyethylene-hexene copolymer,
• polyethylene-octene copolymer polystyrene-butylene-styrene copolymer
• polystyrene-ethylene-butylene-styrene copolymer polystyrene, polyphenylene oxide, polysulfone, polycarbonate, polyester, polyamide, polyamide,
• polyurethane polyacrylate, polyvinylidene chloride, polyvinylidene fluoride,
• polysiloxane polysiloxane, polyolefin ionomer, polymethyl pentene, hydrogenated
• HOCP oligocyclopentadiene
• the high crystalline polypropylene preferably has at least one
• the material of the gellable polymer layer may be selected according to
• polybutylene oxide polyurethane, polyacrylonitrile, polyacrylate, polymethyl
• polyvinylpyrrolidone polytetraethylene glycol diacrylate, polysulfone,
• polyphenylene oxide polycarbonate chloride, polysiloxane, polyolefin ionomer,
• the gellable polymer layer preferably comprises a polymer-lithium salt
• the gellable polymer layer may further comprise at least one selected from the group consisting of LiSCN, LiCIO 4 , LiCF 3 SO 3 ,
• LiAsFg, LiN(CF 3 SO 2 ) 2 , and LiBF 4 each having a lithium lattice energy greater
• gellable polymer layer may further include at least one
• porous inorganic compound selected from the group consisting of SiO 2 , TiO 2 ,
• the multi-component composite film of the present invention is
• gellable polymer layer as well as the support layer film.
• the multi-component composite film is prepared
• the support layer film is preferably prepared by extruding the aforementioned
• an ion-beam irradiation step can be added to the
• the ion beam irradiation modifies the surface of the film, and it can
• the ion-beam irradiation is performed by placing a support layer film in
• the irradiation amount of the ion beam preferably ranges
• At least one reactive gas selected from the group consisting of helium, hydrogen, oxygen, nitrogen,
• ammonia carbon monoxide, carbon dioxide, tetrafluoro carbon, methane, and
• N 2 O is added to the film at a flow rate of 0.5 to 20 n minute in order to modify
• the gellable polymer layer is formed on either or both sides of the
• polymer solution is prepared by dissolving the aforementioned polymer in a
• the solvent is at least one selected from the group consisting of 1 -
• NMP methyl-2-pyrrolidone
• acetone ethanol
• n-propanol n-butanol
• n-hexane n-hexane
• DMF dimethylacetamide
• DMAc dimethylacetamide
• THF tetrahydrofuran
• DMSO sulfoxide
• cyclohexane cyclohexane
• benzene toluene
• xylene cyclohexane
• water or a
• polymer solution can be controlled depending on the material used in
• gellable polymer solution preferably ranges from 0.01 to 90 wt%.
• polymer solution can be prepared by adding the aforementioned lithium salt
• porous inorganic particles or a mixture thereof to the solvent.
• the gellable polymer layer is formed in two ways. First, the support
• layer film is coated with the gellable polymer solution, and the support layer film
• gellable polymer layer is dried under a preferred drying condition to form the gellable polymer layer.
• a release paper or a release film is coated with the gellable polymer
• the polymer film is dried under the suitable drying condition, the polymer film is desorbed from
• the release paper, and the desorbed polymer film is heat-set on the support
• the heat-set process is performed at room temperature to a melting
• layer film or the release film, the coating is performed by various techniques
• the coating technique is not limited in the coating process.
• the thickness of the coated films can be controlled depending on a final use of
• the film ranges from 1 to 50 ⁇ m, the thickness of the gellable polymer layer after
• coating preferably ranges from 0.01 to 25 ⁇ m.
• the coating step can be performed either before or after, or both before
• the drying process of the coated gellable polymer solution is preferably
• Pores are formed on the heat-gellable polymer layer on either or both
• pores are formed on a polymer film by phase transition or a
• pores can be formed through phase transition by
• properties of the prepared film are affected by the phase-transition conditions.
• pores can be formed through a dry process by orientation
• the stretching process is performed after
• gellable polymer layer on either or both sides of the support layer
• precursor is oriented in a certain direction in preparation of a precursor film
• the oriented precursor film is stretched, thereby forming pores.
• pores are formed on the gellable polymer layer by both the phase
• gellable polymer layer are formed by phase transition between the gellable
• gellable polymer layer causes the gellable polymer layer to have various types of structure such as a
• the gellable polymer layer are affected by the method of formation of the pores.
• the stretching process includes low-temperature-stretching and high-
• gellable polymer layer is formed on either or both sides of the support layer film
• the multi-layer is mono-axially or bi-axially
• the multi-film that is low-temperature-stretched and high-temperature-
• the stretched is heat-set.
• the heat-set processing is performed at a temperature
• component composite film comprising the support layer film and gellable
• the multi-component composite film of the present invention has an
• gellable polymer layer due to inter-diffusion between the polymer chains of the
• the gellable polymer layer is not well-defined because the support layer film
• stretching and heat-setting comprises a support layer film having a pore size
• porous gellable polymer layer having a pore size of 10 ⁇ m at most with a
• Fig. 8 shows a cross-sectional view of an exemplary multi-component
• composite film comprising a united support layer film and a gellable polymer
• a multi-component composite film comprising a porous gellable polymer layer which is formed on either or both sides of the porous support
• a + is at least one selected from the group consisting of an
• the multi-component composite film of a) is a polymer, it can be used
• the liquid electrolyte of b) fills up the pores of the support layer film
• gellable polymer layer is swelled and gellated when the liquid
• electrolyte of b) meets the multi-component composite film -of a).
• thickness of the gellable polymer layer is thinner than that of the support film.
• the thin thickness of the gellable polymer brings low impedance that is
• the liquid electrolyte of b) comprises a salt represented by Formula 1
• organic solvent of b) ii) is at least one selected
• PC propylene carbonate
• ethylene carbonate ethylene carbonate
• liquid electrolyte is injected during
• laminated film can be used as a container. Unlike a jellyroll of a lithium ion
• the electrochemical element of the present invention can be applied to
• NMP 1 -methyl-2-pyrrolidone
• the slurry was then coated on aluminum foil on both sides of the aluminum foil. After sufficiently drying at 130 °C, the positive electrodes were prepared by
• the thickness of the positive electrode was 115 ⁇ m.
• the negative electrodes were prepared by pressing.
• the negative electrode was 120 ⁇ m.
• a high crystalline polypropylene was used for a material of a precursor
• the precursor film was prepared from the high crystalline
• the take-up speed was 20 m/min.
• draw down rate (DDR) was 60.
• the precursor film was annealed in a dry oven at 150 ° C for an hour.
• the coated precursor film was mono-axially low-temperature-stretched
• precursor film was heat-set " at 140 ° C under tension for 10 minutes, and it was
• the air permeability and interfacial adhesion strength of the multi- component composite film were respectively measured by JIS P8117 and JIS Z
• wet-out rate of an electrolyte was measured by measuring a time for wet-out of
• the prepared full cell stacked battery was placed within the aluminum
• liquid electrolyte comprising a 1 :2 weight ratio of
• the battery was charged and discharged under the condition of 0.2 C.
• The-battery was charged with the constant current until reaching.4.2V and then
• the other test for evaluating the performance of the battery is to measure the change of capacity according to charge and discharge cycles
• Fig 10 shows the small change in capacity from the
• Each positive electrode was prepared according to the same method as
• the positive electrode has a positive active material coated on both sides of the
• Each negative electrode was prepared was prepared according to the
• the outermost full cells were prepared by coating the slurry and on both sides of
• the negative electrode has an
• the thickness of the negative electrodes was 135 ⁇ m.
• the bicell 23 of Fig. 5a was prepared by placing a both-side coated
• bicell 24 of Fig. 5b was prepared by placing a both-side coated positive electrode in the middle and both-side coated negative
• the multi-component composite films were
• the prepared stacked bicell battery was placed within an aluminum
• plasticizer are not performed, it has both good ionic conductivity and

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